Hello Naresh,
Yes, definitely you can be a Japanese translator or Interpreter what so ever be the age. All you need to have is excellent skills in Japanese. You can start as a freelancer or with internships too. This will give you a kick start and will give you great experience. After that you can head towards further career growth if you wish to.
Moreover, you can take private tutions either offline or online. Due to this pandemic, everyone has started studying online, so you can pursue it as an online teaching too.
And, remember age is just a number. You can start whenever you wish to. You need to have passion and zeal for it.
Hope this sorted your query.
Good Luck :)
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